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This modifies _get_package_mirror_info to convert the hostnames of generated mirror URLs to their IDNA form, and then iterate through them replacing any invalid characters (i.e. anything other than letters, digits or a hyphen) with a hyphen.
This commit introduces the following changes in behaviour:
* generated mirror URLs with Unicode characters in their hostnames will have their hostnames converted to their all-ASCII IDNA form
* generated mirror URLs with invalid-for-hostname characters in their hostname will have those characters converted to hyphens
* generated mirror URLs which cannot be parsed by `urllib.parse.urlsplit` will not be considered for use
* other configured patterns will still be considered
* if all configured patterns fail to produce a URL that parses then the fallback mirror URL will be used
LP: #1868232
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